Size reduction with Cutting Mills

Cutting Mills RETSCH cutting mills are used successfully for the efficient preliminary size reduction of a huge vari-ety of materials. The mills offer a high level of operational safety and convenience. The wide selection of accessories allows for easy adaptation to different application requirements.

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CUTTING MILLS

CONTENTS

Cutting Mills

– Applications 4

– Cutting Mill SM 300 7– Cutting Mill SM 200 8– Cutting Mill SM 100 9

– Selection guide / Technical data 9

– Accessories – Rotors 10 – Hoppers 10 – Bottom sieves 10 – Cyclone-suction-combination 11 – Sample collecting systems 11

– Order data 11-12

Fine grinding withUltra Centrifugal Mills

Pulverization with Mixer Mills

Sample Divider

RETSCH cutting mills are used for the preliminary size reduction of soft, medium-hard, fibrous, elastic and tough materials. A representative sub-sample should then be taken for the subsequent reduction down to analytical fineness.

RETSCH‘s Ultra Centrifugal Mill is suitable for grinding soft, medium-hard and brittle materials with a feed size up to 10 mm. It achieves grind sizes down to 40 microns.

No matter whether rotary sample dividers, rotary tube sample dividers or sample splitters – RETSCH sample dividers will provide you with representative sub-samples from pourable powders and bulk materials.

Milling– Jaw Crushers– Rotor Mills– Cutting Mills– Knife Mills– Mortar Grinders– Disc Mills– Mixer Mills– Planetary Ball MillsSievingAssisting

Product videos at

www.retsch.com/videos

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For the pulverization of hard, medium-hard and brittle as well as soft, elastic or fi-brous products RETSCH mixer mills are highly suitable. They are used for small sample volumes and cryogenic grinding.

CUTTING MILLS

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Applications

Cutting mills are used for the preliminary grinding of soft, medium-hard, elastic and fibrous materials as well as heterogeneous mixes of prod-ucts. Size reduction by cutting and shearing is carried out gently and quickly which makes the mills suitable for temperature-sensitive samples. Typical applications of the cutting mills include sample preparation for heavy metal analysis within the context of RoHS and WEEE, size reduction of refuse derived fuels as well as processing of biomass for renewable energy research.

The main areas of application for cutting mills are:

AgriculturePlant materials, straw

Chemicals and plasticsPET preforms, plastic toys, polymers, resins, rubber

Environmental researchCables, cardboard, electronic components, foil, leather, paper, refuse derived fuels, textiles, waste, wood

Foods and feedsAnimal feed, feed pellets, spices

Geology and metallurgyAluminum slag, lignite, non-ferrous metals

Medicine and pharmaceuticalsBones, drugs, pharmaceutical products

and many more...

Cutting mills Model*Generalremarks

Rotor Sieve Feed sizeSampleamount

Grindingtime

SpeedFinal

fineness

Bones SM 200 6-disc 8 mm Ø 30 x 100 mm 100 g 1 min 1,500 min-1 6 mm

Electr. scrap/circuit boards

SM 300 6-disc 4 mm 60 x 100 mm 4 pcs. 1 min 1,500 min-1 3 mm

Feed pellets SM 100 Parallel 4 mm 15 mm 500 g 3 min 1,500 min-1 1.5 mm

Paper SM 100 scrunched up Parallel 4 mm DIN A4 100 g 2 min 1,500 min-1 2 mm

PET preforms SM 300 6-disc 6 mm Ø 30 x 100 mm 6 pcs. 1 min 700 min-1 5 mm

Refuse derivedfuels (RDF)

SM 300 light fraction Parallel 4 mm 60 mm 2 l 2 min 3,000 min-1 4 mm

Rubber soles SM 300 in quarters Parallel 6 mm 100 x 150 mm 200 g 1 min 3,000 min-1 5 mm

Straw SM 300 Parallel 1.5 mm 200 mm 100 g 30 sec 1,500 min-1 95% <0.5 mm

Thermoplastic SM 300pre-coolingwith LN2

6-disc 8 mm 130 x 60 x 30 mm 350 g 30 sec 2,000 min-1 6 mm

Wood SM 300cyclone-suction-

combinationParallel 1 mm 20 x 50 x 200 mm 500 g 3 min 2,500 min-1 95%

<0.5 mm

This chart serves only for orientation purposes.*Some of the sample materials could also be successfully processed in another model of the cutting mill family.

The RETSCH application database contains more than 1,000 application reports. Please visit www.retsch.com/applicationdatabase.

Application

examples

Free test grinding

For RETSCH, professional customer service includes offering our customers the indi-vidual advice they need to find the best possible solution for their sample prepara-tion task. To achieve this our application laboratories process and measure samples free-of-charge and provide a recommen-dation for the most suitable method and instrument.

For more information please visit our web-site www.retsch.com/testgrinding.

Size reduction in the cutting mills takes place by cutting and shearing forces. The sample passes through the hopper and into the grinding chamber. There it comes into contact with the rotor and is comminuted between the rotor blades and the stationary cutting bars inserted in the housing. The dwelling time of the sample in the chamber is short; as soon as it is small enough to pass through the openings of the bottom sieve it is discharged and collected in the receptacle. The rotor speed of 1,500 min-1 (SM 100 and SM 200)

Cutting mill technology

resp. 700 to 3,000 min-1 (SM 300) ensures gentle and rapid size reduction. The motor ratings are 1.5 kW (SM 100), 2.2 kW (SM 200) and 3 kW (SM 300). The op-tional cyclone-suction-combination (SM 200, SM 300) not only has a cooling effect on the sample but also improves the discharge of ma-terial from the grinding chamber.

CUTTING MILLS

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Cutting Mills SM 100, SM 200 and SM 300

The RETSCH cutting mills provide highly efficient primary size reduction of such heterogeneous material mixes as waste or electronic components but are also suitable for many other types of samples. With the SM 100, SM 200 and SM 300 RETSCH offers three models for different require-ments. No matter, whether it is a standard mill for routine applications or a powerful and flexible model to handle a vast range of sample materi-als, RETSCH provides the suitable in-strument. A wide selection of sieves, hoppers and collecting systems allows for easy adaptation to individual

application tasks. All three models are available in a special version for heavy-metal-free size reduction which makes them ideal for prepar-ing samples for heavy metal analysis within the context of RoHS and WEEE regulations.

Benefits at a glance

■ Powerful primary and fine size reduction

■ Selection of models to suit different requirements

■ Quick cleaning, easy handling■ Defined final fineness due to

bottom sieves with aperture sizes from 0.25 - 20 mm

■ Wide range of accessories including various hoppers, collecting systems, rotors and sieves

■ Highest safety standard

SM 100 SM 200 SM 300

The perfect

cutting mill for

every requirement

CUTTING MILLS

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Cutting Mill SM 300

Operation of the SM 300 is excep-tionally simple and safe. A safety switch prevents the mill from being switched on with the door open. An electronic safety check ensures that the door cannot be opened when the motor is running – the motor brake makes the rotor come to an immediate standstill after the mill has been switched off.

Easy operation and cleaning

The hopper can be folded back to get full access to the grinding chamber which, in combination with the smooth surfaces, greatly facilitates cleaning the mill. The push-fit rotor can be removed without tools.

The variable speed is entered via the convenient operating

panel of the SM 300

Benefits at a glance

■ Powerful size reduction thanks to 3 kW drive with high torque and RES technology

■ Perfect adaptation to application requirements by variable speed from 700 to 3,000 min-1

■ Optimum cutting effects thanks to double acting cutting bars

■ Quick and easy cleaning due to fold-back hopper, smooth surfaces and push-fit rotor

■ Highest safety standards due to motor brake, central locking device, electronic safety check and comfort base frame

High torque for primary and fine size reduction

Cutting mills are used in many different areas of sample preparation for subse-quent analyses. To allow for optimum adaptation to the sample properties with regards to breaking behavior and temperature sensitivity, the SM 300 features a variable speed from 700 to 3,000 min-1. Thus it is possible to grind a great variety of products with one mill, including tough and thermally sensitive materi-als. Thanks to its flexibility, the SM 300 is particularly suitable for the varying application tasks of contract laboratories.

An additional flywheel mass accounts for a very high torque which enables the SM 300 to grind many materials to analytical fineness in only one working run (RES technology, see text on the right). The grinding chamber geometry has been thoroughly optimized. The good feeding properties and the wide opening of the hopper allow for large sample volumes resp. pieces which helps to improve the throughput. Moreover, the SM 300 is equipped with double acting cutting bars which substantially increase the number and effectiveness of the cutting events.

In combination with the wide selection of accessories, the SM 300 is ideally suited for the effective size reduction of cuttable materials and heterogeneous mixes.

SM 300 with fold-backuniversal hopper

The high perfor-

mance model with

RES technology

RES Technology – Peak power of up to 20 kW

The diagram shows the torque (green) and the power (blue) of the drive as well as the temporarily achievable peak power (red) against the speed. The peak power increases over the entire speed range. That means, the higher the speed, the more power is temporarily available for the cutting events. In the speed range up to 1,500 rpm, the power is a result of the product of torque and speed. It ascends linearly until reaching the nominal power. This means, if the speed is doubled from 750 rpm to 1,500 rpm, the power is also doubled from 1.5 kW to 3 kW (maximum drive performance).

At speeds >1,500 rpm, the power remains constant (maximum drive performance). The available torque decreases because of the afore-mentioned proportionality. In this speed range, the available peak power is gained by the great flywheel mass (Rotational En-ergy Storage technology). Here the power corresponds to the rotational energy stored in the flywheel mass which increases quadratically with the speed. If the speed is doubled from 1,500 rpm to 3,000 rpm, the temporarily available peak power is quadrupled from 5 kW to 20 kW.

This additional energy allows for the successful size reduction of difficult materials, such as, for example, rubber shoe soles in the SM 300 without rotor blockage.

CUTTING MILLS

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Smooth surfaces

5 l collecting receptacle included in delivery(Cyclone-suction-combination, 30 l collect-ing receptacle and vari-ous filters optionally available)

3 kW drive with additional flywheel mass

Ergonomic key pad with digital parameter setting

Bottom sieve

Comfort base frame with wheels and storage area

Push-fit rotor(6-disc rotor or parallel section rotor)

Fold-back hopper with plas-tic plunger (also available in wood or aluminum)

Large feed opening with splash-back protection

Double acting

cutting bars

20

16

12

8

4

0

Torque / Nm

Peak power / kW

Power/ kW

[min-1]

[Nm]

Speed

To

rqu

e

Performance diagram SM 300

Po

wer

/ P

eak p

ow

er

0 500 1.000 1.500 2.000 2.500 3.000

[kW]

50

40

30

20

10

0

CUTTING MILLS

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Cutting MillSM 200

The universal

standard model

Tips for perfect results

Benefits at a glance

■ Powerful size reduction with 2.2 kW drive

■ Optimum cutting effects thanks to double acting cutting bars

■ Quick and easy cleaning due to fold-back hopper, smooth surfaces and push-fit rotor

■ High safety standard due to motor brake, central locking device and base frame

Powerful size reduction of many different materials

The RETSCH cutting mill SM 200 is a powerful and easy-to-operate instru-ment for efficient primary and fine size reduction.

Within the group of the RETSCH cut-ting mills, it is the universal standard model which covers a vast range of applications with its strong 2.2 kW drive and 1,500 rpm rotor speed. When operated with the optional cyclone-suction-combination, the SM 200 is also suitable for grinding light sample materials or smaller quantities.

Operation of the SM 200 is easy and safe. A safety switch prevents the mill from being switched on with the door open. A motor brake makes the rotor come to an immediate standstill after the mill has been switched off.

The hopper can be folded back andthe push-fit rotor and sieve can be removed without tools for easy cleaning.

In combination with its various ac-cessories, the SM 200 can be used for many different applications. In addition to a heavy-metal-free version, a wide selection of hoppers, rotors, sieves and collecting systems (see pages 10 – 11) is available.

SM 200 with fold-backhopper andparallel section rotor

Fibrous and bulky materi-als (e. g. hay or paper) are easier to grind when they have been balled up before being fed into the hopper.

The size reduction of rubber and thermoplastic is facilitated by using liquid nitrogen to embrittle the sample material.

If larger sample pieces need to be ground very finely, it is recommended to first use a bottom sieve with large perfora-tions for primary size reduction and then a smaller sieve for fine grinding.

CUTTING MILLS

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Selection guide for cutting mills

Cutting MillSM 100

The budget-priced

basic model

Performance data SM 100 SM 200 SM 300 www.retsch.com/sm100 www.retsch.com/sm200 www.retsch.com/sm300

Applications size reduction by cutting size reduction by cutting size reduction by cutting

Fields of application agriculture, biology, chemicals / plastics, food,

engineering / electronics, medicine / pharmaceuticals, environment / recycling

Feed material soft, medium-hard, soft, medium-hard, tough, soft, medium-hard, tough,

elastic, fibrous elastic, fibrous elastic, fibrous

Material feed size* max. 60 x 80 mm max. 60 x 80 mm max. 60 x 80 mm

Final fineness* 0.25 - 20 mm 0.25 - 20 mm 0.25 - 20 mm

Cutting bars standard cutting bars double acting cutting bars double acting cutting bars

Rotors 6-disc rotor: yes yes yes

Parallel section rotor: yes yes yes

Hopper Universal hopper: yes yes, fold-back yes, fold-back

Long stock hopper: yes yes, fold-back yes, fold-back

Collecting receptacle Standard: 5 liters 5 liters 5 liters

Options: 0,25 / 0,5 / 30 liters 0,25 / 0,5 / 30 liters 0,25 / 0,5 / 30 liters

with cyclone: – 0,5 / 1 / 2 / 5 liters 0,5 / 1 / 2 / 5 liters

Technical DataDrive 3-phase-motor 3-phase-motor frequency-controlled

3-phase-motor

Motor brake – yes yes

Rotor speed at 50 Hz 1,500 min-1 1,500 min-1 700 – 3,000 min-1

Drive power 1,500 W 2,200 W 3,000 W

W x H x D (with base frame approx. 582 x 1.675 x 700 mm approx. 576 x 1.675 x 760 mm approx. 795 x 1.691 x 765 mm

and universal hopper)

Net weight (without hopper) approx. 73 kg approx. 90 kg approx. 160 kg

*depending on feed material and instrument configuration/settings

For routine applications

The SM 100 is the budget-priced basic model among the RETSCH cutting mills. It is suitable for the size reduction of soft, medium-hard, elastic or fibrous products which can be comminuted without requiring extremely high forces. The mill is particularly suitable for routine applications. It is easy to operate and can be mounted on a solid table or on the optional base frame.

The wide range of accessories makes the SM 100 a versatile instrument. A special version of the mill is available for heavy-metal-free grinding.

SM 100 withuniversal hopper,parallel section rotor and optional base frame

Perfect adaptation to application requirements

CUTTING MILLS

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Accessories for cutting mills

Selection of rotors

2 different rotor versions are available for the cutting mills: a parallel section rotor and a 6-disc rotor.

The parallel section rotor (1) is equipped with 3 cutting plates (2) and is suitable for universal use. The 6-disc rotor (3) with its 18 replaceable and reversible hard metal cutting tips (4) is mostly used for medium-hard and brittle materials. Both rotors are available in steel St 1.0580 for heavy-metal-free size reduction. The optional extrac-tion tool (5) provides for convenient removal of the rotor.

The table gives a rough orientation as to which instrument configura-tion is most suitable for which type of material.

Thanks to the comprehensive range of accessories, the RETSCH cutting mills are universally suitable size reduction instruments.

Selection of hoppers

The convenient universal hopper (A) is suitable for feeding most of the bulk and individual samples. The maximum input open-ing is 88 x 84 mm. The hopper is supplied with a plastic plunger. For special applications plungers made from wood or aluminum are available.

The long stock hopper (B) is specially designed for feeding in long samples. The maximum input opening is 30 x 80 mm. A wooden plunger is part of the delivery scope.

Selection of bottom sieves

The bottom sieve is selected according to the type of sample and degree of final fineness required. Sieves with a perforation size up to 2 mm have trapezoid holes (C); sieves 4 mm and above have square holes (D). For coarse, preliminary size reduction the use of a 20 mm bottom sieve is recommended. The standard sieve versions are made of stainless steel. Bottom sieves made of steel St 1.0353 are also available for heavy-metal-free size reduction.

1. Parallel section rotor, 2. Cutting plate for parallel section rotor, 3. 6-disc rotor, 4. Reversible cutting tips, 10 pcs., 5. Extraction tool for rotor

++ highly suitable + suitable to a limited extent optimum speed

*The size reduction of elastic and temperature-sensitive samples can be improved by cooling with dry ice or pre-embrittlement with LN2.

Type of material

medium-hard/brittle

medium-hard/elastic*

medium-hard

soft

elastic*

tough-elastic*

fibrous

700 min-1 1,500 min-1 3,000 min-1

recommended speed

++

++ +

++ ++

+ ++

+ ++

+ ++

++

6-d

isc

roto

r

Para

llel

sect

ion r

oto

r

CUTTING MILLS

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Sample collecting systems Item no.Cyclone-suction-combination for SM 200 / SM 300

Cyclone unit incl. 1 sample bottle 500 ml (to be used with industrial vacuum cleaner) 22.020.0004

Industrial vacuum cleaner HDS 2000, 230 V, 50/60 Hz (other electrical versions available) 22.748.0002

Filter bags for industrial vacuum cleaner HDS 2000, 5 pieces 32.524.0005

HEPA filter for industrial vacuum cleaner HDS 2000, 1 piece 32.524.0006

Sample bottles, 500 ml, 10 pieces 22.523.0002

Holder for sample bottles 1 / 2 / 5 liters 22.001.0001

Sample bottle, 1 liter, 1 piece, to be used with holder 22.001.0001 05.239.0011

Sample bottle, 2 liters, 1 piece, to be used with holder 22.001.0001 05.239.0010

Sample bottle, 5 liters, 1 piece, to be used with holder 22.001.0001 05.239.0009

Collecting receptacles for SM 100 / SM 200 / SM 300

Collecting unit 250 / 500 ml, incl. 2 sample bottles 22.003.0008

Sample bottles, 250 ml, 10 pieces 22.523.0001

Collecting receptacle, 5 liters, stainless steel 22.003.0007

Collecting receptacle, 30 liters, plastic, incl. adapter and filter hose 22.003.0010

Ring-type filter for collecting receptacle 5 liters 22.187.0006

Dust filter clamping rings for ring-type filter, incl. 5 dust filters 22.748.0001

Dust filters for ring-type filter, 25 pieces 22.524.0002

Filter hose for collecting receptacle 5 litres, incl. holder 22.187.0007

Order data sample collecting systems

Other Accessories

For a higher throughput the 5 liters collecting receptacle can be replaced by a 30 liters plastic receptacle. For smaller quantities, a collecting unit for 250 ml and 500 ml sample bottles is available. For bottom sieves with small aperture sizes the use of a stainless steel ring-type filter between mill and collecting receptacle is recommended.

Cyclone-Suction-Combination

The SM 300 can be optionally equipped with a cyclone-suction-combination. In addition to a cooling effect on the sample material and the grinding tools, it also improves the discharge of material from the grinding chamber and is therefore recommended for grinding small volumes or low density materials. Thanks to the improved discharge less cleaning is required. The cyclone can be equipped with 0.5, 1, 2 and 5 liters sample bottles.

SM 300 with cyclone-suction-combination

Collecting receptacle, 5 liters

(included in delivery)

Ring-type filter andcollecting receptacle,

5 liters

Collecting receptacle, 5 liters

with filter hose

Collecting receptacle, 30 liters

with filter hose

Collecting unit for sample bottles, 250 / 500 ml

Prin

ted in G

erm

any

Subje

ct t

o t

echnic

al m

odific

atio

n a

nd e

rrors

. 99.7

28.0

001/E

N-0

1-2

013

RETSCH – Your specialist for sample preparation offers you a compre-hensive range of equipment. Please request information on our crushers, mills, sieve shakers, sample dividers, feeders as well as cleaning and dry-ing machines.

CUTTING MILLS

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Order data cutting mills

Cutting mills Item no. Item no.supplied with collecting receptacle, 5 liters and base frame (only SM 200 and SM 300)

(please order rotor, hopper, bottom sieve, and for SM 100 base frame, separately)

Cutting mills for standard size reduction for heavy-metal-free size reduction

SM 100 3~ 400 V, 50 Hz 20.727.0001 20.727.0002

Base frame with wheels for SM 100 22.824.0005

SM 200 3/N~ 400 V, 50 Hz 20.728.0001 20.728.0002

SM 300 220–230 V, 50/60 Hz 20.729.0002 20.729.0005

other electrical versions available for the same price

Rotors for SM 100 / SM 200 / SM 300 for standard size reduction for heavy-metal-free size reduction

6-disc rotor stainless steel: 22.608.0022 steel 1.0580: 22.608.0028

Parallel section rotor stainless steel: 22.608.0021 steel 1.0580: 22.608.0018

Hoppers for SM 100 / SM 200 / SM 300 for SM 100 for SM 200 / SM 300

Universal hopper with plastic plunger 22.785.0007 22.785.0001

Long stock hopper with wooden plunger 22.408.0004 22.408.0003

Plastic plunger for universal hopper 22.725.0010 22.725.0010

Wooden plunger for universal hopper 22.725.0011 22.725.0011

Aluminum plunger for universal hopper 22.725.0012 22.725.0012

Bottom sieves

Trapezoid holes, stainless steel 0.25 mm 0.50 mm 0.75 mm 1.00 mm 1.50 mm

for standard size reduction 03.647.0312 03.647.0313 03.647.0314 03.647.0315 03.647.0316

Square holes, stainless steel 2.00 mm 4.00 mm 6.00 mm 8.00 mm 10.00 mm 20.00 mm

for standard size reduction 03.647.0318 03.647.0320 03.647.0321 03.647.0322 03.647.0024 03.647.0062

Trapezoid holes, steel 1.0353 0.25 mm 0.50 mm 0.75 mm 1.00 mm 1.50 mm

for grinding without heavy-metal contamination – 03.647.0326 03.647.0327 03.647.0328 –

Square holes, steel 1.0353 2.00 mm 4.00 mm 6.00 mm 8.00 mm 10.00 mm 20.00 mm

for grinding without heavy-metal contamination – 03.647.0333 – 03.647.0335 – –

Additional items

IQ/OQ Documentation for SM 200 99.200.0013

IQ/OQ Documentation for SM 300 99.200.0014

Please refer to the previous page for order data of various sample collecting systems.

Accessories for Rotors Item no. Item no.Reversible cutting tips for 6-disc rotor for standard size reduction for heavy-metal-free size reduction

Reversible cutting tips, 10 pieces tungsten carbide: 22.908.0001 tungsten carbide: 22.908.0001

Cutting plates for parallel section rotor

Cutting plates, 1 set (3 pieces) stainless steel: 22.151.0004 steel 1.1740: 22.151.0006

Cutting bars for SM 100

Cutting bars, 1 set (3 pieces) stainless steel: 22.152.0007 steel 1.1740: 22.152.0009

Double acting cutting bars for SM 200 / SM 300

Double acting cutting bars, 1 set (3 pieces) stainless steel: 22.152.0003 steel 1.1740: 22.152.0005

Additional items

Replacement extraction tool for rotor 22.225.0002

Retsch GmbHRetsch-Allee 1-542781 Haan, Germany

Telephone +49 2104/2333-100Telefax +49 2104/2333-199

E-Mail info@retsch.comInternet www.retsch.com